Toyota Rav4 4 Cylinders 2008

GOOD DAY.
I am repairing an engine of a Toyota Rav4 4 cylinders model 2008, and I want to know how the position of the balancers are going, they are two, if they carry poision, since I do not look at that detail, the gear of the crankshaft that makes contact with those two gears if it carries a tooth a point of reference, but the balancers do not take any mark, for whether anyone knows if they have a position or not.